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      <p>最近项目中接触到需要修改手机按键的需求，整理一下分享给大家</p>
<p>双击power键大概流程</p>
<p><img src="/images/20220906/20220906001.jpg"></p>
<p><strong>PhoneWindowManager.java</strong>类是 处理各种 power 键流程的地方，路径如下:</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">\frameworks\base\services\core\java\com\android\server\policy\PhoneWindowManager.java</span><br></pre></td></tr></table></figure>
<p>关键代码:</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line">case KeyEvent.KEYCODE_POWER: &#123;</span><br><span class="line">    EventLogTags.writeInterceptPower(</span><br><span class="line">            KeyEvent.actionToString(event.getAction()),</span><br><span class="line">            mPowerKeyHandled ? 1 : 0,</span><br><span class="line">            mSingleKeyGestureDetector.getKeyPressCounter(KeyEvent.KEYCODE_POWER));</span><br><span class="line">    // Any activity on the power button stops the accessibility shortcut</span><br><span class="line">    result &amp;= ~ACTION_PASS_TO_USER;</span><br><span class="line">    isWakeKey = false; // wake-up will be handled separately</span><br><span class="line">    if (down) &#123;</span><br><span class="line">        /*SPRD : add power debug log start*/</span><br><span class="line">        Slog.d(TAG, &quot;Receive Input KeyEvent of Powerkey down&quot;);</span><br><span class="line">        /*SPRD : add power debug log end*/</span><br><span class="line">        interceptPowerKeyDown(event, interactiveAndOn);</span><br><span class="line">    &#125; else &#123;</span><br><span class="line">        /*SPRD : add power debug log start*/</span><br><span class="line">        Slog.d(TAG, &quot;Receive Input KeyEvent of Powerkey up&quot;);</span><br><span class="line">        /*SPRD : add power debug log end*/</span><br><span class="line">        interceptPowerKeyUp(event, canceled);</span><br><span class="line">    &#125;</span><br><span class="line">    break;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>power键按下在<strong>interceptPowerKeyDown</strong>()执行，松开的操作在<strong>interceptPowerKeyUp</strong>()中执行<strong>interceptPowerKeyDown</strong>()方法中会调用<strong>GestureLauncherService.java</strong>的 <strong>interceptPowerKeyDown</strong>()方法<br>关键代码:</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line">// The camera gesture will be detected by GestureLauncherService.</span><br><span class="line">private boolean handleCameraGesture(KeyEvent event, boolean interactive) &#123;</span><br><span class="line">    // camera gesture.</span><br><span class="line">    if (mGestureLauncherService == null) &#123;</span><br><span class="line">        return false;</span><br><span class="line">    &#125;</span><br><span class="line">    mCameraGestureTriggered = false;</span><br><span class="line">    final MutableBoolean outLaunched = new MutableBoolean(false);</span><br><span class="line">    final boolean intercept =</span><br><span class="line">            mGestureLauncherService.interceptPowerKeyDown(event, interactive, outLaunched);</span><br><span class="line">    if (!outLaunched.value) &#123;</span><br><span class="line">        // If GestureLauncherService intercepted the power key, but didn&#x27;t launch camera app,</span><br><span class="line">        // we should still return the intercept result. This prevents the single key gesture</span><br><span class="line">        // detector from processing the power key later on.</span><br><span class="line">        return intercept;</span><br><span class="line">    &#125;</span><br><span class="line">    mCameraGestureTriggered = true;</span><br><span class="line">    if (mRequestedOrSleepingDefaultDisplay) &#123;</span><br><span class="line">        mCameraGestureTriggeredDuringGoingToSleep = true;</span><br><span class="line">    &#125;</span><br><span class="line">    return true;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>跟踪看看<strong>GestureLauncherService.java</strong> 中 执行 **interceptPowerKeyDown()**方法如下<br><strong>GestureLauncherService.java</strong>，路径如下：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">/frameworks/base/services/core/java/com/android/server/GestureLauncherService.java</span><br></pre></td></tr></table></figure>
<p>关键代码:</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br></pre></td><td class="code"><pre><span class="line">public boolean interceptPowerKeyDown(KeyEvent event, boolean interactive,</span><br><span class="line">            MutableBoolean outLaunched, boolean isScreenOn) &#123;</span><br><span class="line">        if (event.isLongPress()) &#123;</span><br><span class="line">            // Long presses are sent as a second key down. If the long press threshold is set lower</span><br><span class="line">            // than the double tap of sequence interval thresholds, this could cause false double</span><br><span class="line">            // taps or consecutive taps, so we want to ignore the long press event.</span><br><span class="line">            return false;</span><br><span class="line">        &#125;</span><br><span class="line">        boolean launchCamera = false;</span><br><span class="line">        boolean launchEmergencyGesture = false;</span><br><span class="line">        boolean intercept = false;</span><br><span class="line">        long powerTapInterval;</span><br><span class="line">        synchronized (this) &#123;</span><br><span class="line">            powerTapInterval = event.getEventTime() - mLastPowerDown;</span><br><span class="line">            mLastPowerDown = event.getEventTime();</span><br><span class="line">            if (powerTapInterval &gt;= POWER_SHORT_TAP_SEQUENCE_MAX_INTERVAL_MS) &#123;</span><br><span class="line">                // Tap too slow, reset consecutive tap counts.</span><br><span class="line">                mPowerButtonConsecutiveTaps = 1;</span><br><span class="line">                mPowerButtonSlowConsecutiveTaps = 1;</span><br><span class="line">            &#125; else if (powerTapInterval &gt;= CAMERA_POWER_DOUBLE_TAP_MAX_TIME_MS) &#123;</span><br><span class="line">                // Tap too slow for shortcuts</span><br><span class="line">                mPowerButtonConsecutiveTaps = 1;</span><br><span class="line">                mPowerButtonSlowConsecutiveTaps++;</span><br><span class="line">            &#125; else &#123;</span><br><span class="line">                // Fast consecutive tap</span><br><span class="line">                mPowerButtonConsecutiveTaps++;</span><br><span class="line">                mPowerButtonSlowConsecutiveTaps++;</span><br><span class="line">            &#125;</span><br><span class="line">            // Check if we need to launch camera or emergency gesture flows</span><br><span class="line">            if (mEmergencyGestureEnabled) &#123;</span><br><span class="line">                // Commit to intercepting the powerkey event after the second &quot;quick&quot; tap to avoid</span><br><span class="line">                // lockscreen changes between launching camera and the emergency gesture flow.</span><br><span class="line">                if (mPowerButtonConsecutiveTaps &gt; 1) &#123;</span><br><span class="line">                    intercept = interactive;</span><br><span class="line">                &#125;</span><br><span class="line">                if (mPowerButtonConsecutiveTaps == EMERGENCY_GESTURE_POWER_TAP_COUNT_THRESHOLD) &#123;</span><br><span class="line">                    launchEmergencyGesture = true;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">            if (mCameraDoubleTapPowerEnabled</span><br><span class="line">                    &amp;&amp; powerTapInterval &lt; CAMERA_POWER_DOUBLE_TAP_MAX_TIME_MS</span><br><span class="line">                    &amp;&amp; mPowerButtonConsecutiveTaps == CAMERA_POWER_TAP_COUNT_THRESHOLD) &#123;</span><br><span class="line">                launchCamera = true;</span><br><span class="line">                intercept = interactive;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        if (mPowerButtonConsecutiveTaps &gt; 1 || mPowerButtonSlowConsecutiveTaps &gt; 1) &#123;</span><br><span class="line">            Slog.i(TAG, Long.valueOf(mPowerButtonConsecutiveTaps)</span><br><span class="line">                    + &quot; consecutive power button taps detected, &quot;</span><br><span class="line">                    + Long.valueOf(mPowerButtonSlowConsecutiveTaps)</span><br><span class="line">                    + &quot; consecutive slow power button taps detected&quot;);</span><br><span class="line">        &#125;</span><br><span class="line">        if (launchCamera) &#123;</span><br><span class="line">            Slog.i(TAG, &quot;Power button double tap gesture detected, launching camera. Interval=&quot;</span><br><span class="line">                    + powerTapInterval + &quot;ms&quot;);</span><br><span class="line">                // 调用开启相机</span><br><span class="line">                launchCamera = handleCameraGesture(false /* useWakelock */,</span><br><span class="line">                        StatusBarManager.CAMERA_LAUNCH_SOURCE_POWER_DOUBLE_TAP);</span><br><span class="line">            if (launchCamera) &#123;</span><br><span class="line">                mMetricsLogger.action(MetricsEvent.ACTION_DOUBLE_TAP_POWER_CAMERA_GESTURE,</span><br><span class="line">                        (int) powerTapInterval);</span><br><span class="line">                mUiEventLogger.log(GestureLauncherEvent.GESTURE_CAMERA_DOUBLE_TAP_POWER);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; else if (launchEmergencyGesture) &#123;</span><br><span class="line">            Slog.i(TAG, &quot;Emergency gesture detected, launching.&quot;);</span><br><span class="line">            launchEmergencyGesture = handleEmergencyGesture();</span><br><span class="line">            mUiEventLogger.log(GestureLauncherEvent.GESTURE_EMERGENCY_TAP_POWER);</span><br><span class="line">        &#125;</span><br><span class="line">        mMetricsLogger.histogram(&quot;power_consecutive_short_tap_count&quot;,</span><br><span class="line">                mPowerButtonSlowConsecutiveTaps);</span><br><span class="line">        mMetricsLogger.histogram(&quot;power_double_tap_interval&quot;, (int) powerTapInterval);</span><br><span class="line"></span><br><span class="line">        outLaunched.value = launchCamera || launchEmergencyGesture;</span><br><span class="line">        // Intercept power key event if the press is part of a gesture (camera, eGesture) and the</span><br><span class="line">        // user has completed setup.</span><br><span class="line">        return intercept &amp;&amp; isUserSetupComplete();</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>

<p>系统会对<strong>mCameraDoubleTapPowerEnabled</strong> 取值，核心是通过resources.getBoolean(com.android.internal.R.bool.config_cameraDoubleTapPowerGestureEnabled) 来取，<br>其实这个值是配置在/frameworks/base/core/res/res/values/config.xml中，这里是为true的</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">&lt;!-- Allow the gesture to double tap the power button twice to start the camera while the device</span><br><span class="line">         is non-interactive. --&gt;</span><br><span class="line">&lt;bool name=&quot;config_cameraDoubleTapPowerGestureEnabled&quot;&gt;true&lt;/bool&gt;</span><br></pre></td></tr></table></figure>

<p>接下来会分别对power连续按2或者1次进行判断，如果<strong>mCameraDoubleTapPowerEnabled = true</strong> 会通过比较按键的时间<strong>powerTapInterval</strong>小于系统默认时间(<strong>CAMERA_POWER_DOUBLE_TAP_MAX_TIME_MS</strong>=300毫秒),<br><strong>mPowerButtonConsecutiveTaps</strong>计数加1，说明连续按power键，或者延迟最大500毫秒内连续按键，系统预计用户接下来可能会执行一些操作，计数也会加1</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">static final long POWER_SHORT_TAP_SEQUENCE_MAX_INTERVAL_MS = 500;</span><br><span class="line"></span><br><span class="line">static final long CAMERA_POWER_DOUBLE_TAP_MAX_TIME_MS = 300;</span><br><span class="line"></span><br><span class="line">powerTapInterval = event.getEventTime() - mLastPowerDown;</span><br><span class="line">mLastPowerDown = event.getEventTime();</span><br><span class="line"></span><br><span class="line">if (mCameraDoubleTapPowerEnabled</span><br><span class="line">                    &amp;&amp; powerTapInterval &lt; CAMERA_POWER_DOUBLE_TAP_MAX_TIME_MS</span><br><span class="line">                    &amp;&amp; mPowerButtonConsecutiveTaps == CAMERA_POWER_TAP_COUNT_THRESHOLD)</span><br><span class="line"></span><br><span class="line">if (powerTapInterval &lt; POWER_SHORT_TAP_SEQUENCE_MAX_INTERVAL_MS)</span><br></pre></td></tr></table></figure>

<p>执行完成之后会调用<strong>handleCameraGesture</strong>()方法调用开启摄像机。</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line">@VisibleForTesting</span><br><span class="line">boolean handleCameraGesture(boolean useWakelock, int source) &#123;</span><br><span class="line">    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, &quot;GestureLauncher:handleCameraGesture&quot;);</span><br><span class="line">    try &#123;</span><br><span class="line">        boolean userSetupComplete = isUserSetupComplete();</span><br><span class="line">        if (!userSetupComplete) &#123;</span><br><span class="line">            if (DBG) &#123;</span><br><span class="line">                Slog.d(TAG, String.format(</span><br><span class="line">                        &quot;userSetupComplete = %s, ignoring camera gesture.&quot;,</span><br><span class="line">                        userSetupComplete));</span><br><span class="line">            &#125;</span><br><span class="line">            return false;</span><br><span class="line">        &#125;</span><br><span class="line">        if (DBG) &#123;</span><br><span class="line">            Slog.d(TAG, String.format(</span><br><span class="line">                    &quot;userSetupComplete = %s, performing camera gesture.&quot;,</span><br><span class="line">                    userSetupComplete));</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        if (useWakelock) &#123;</span><br><span class="line">            // Make sure we don&#x27;t sleep too early</span><br><span class="line">            mWakeLock.acquire(500L);</span><br><span class="line">        &#125;</span><br><span class="line">        StatusBarManagerInternal service = LocalServices.getService(</span><br><span class="line">                StatusBarManagerInternal.class);</span><br><span class="line">        // 启动相机</span><br><span class="line">        service.onCameraLaunchGestureDetected(source);</span><br><span class="line">        return true;</span><br><span class="line">    &#125; finally &#123;</span><br><span class="line">        Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>原生双击启动相机流程差不多就是这样，有任何问题欢迎留言讨论</p>

      
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